196fc37669f3b662fecc9e4
author Hans Verkuil <hverkuil@xs4all.nl> 1290764631 -0300
committer Mauro Carvalho Chehab <mchehab@redhat.com> 1291241418 -0200

[media] v4l2-dev: use mutex_lock_interruptible instead of plain mutex_lock

Where reasonable use mutex_lock_interruptible instead of mutex_lock.
Also fix the poll, read and write error codes when called with an unregistered
device (e.g. after a USB device was disconnected). Poll must return
POLLERR|POLLHUP and read/write must return -ENODEV.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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